Seam between two perfectly spliced meshes

Development Rendering
,
1

Hi folks,
I’m new to this forum and I’m not sure if I chose the right category for my question. If not, I apologize.
This question has been bugging me and my team for a few days now, we’re looking to create a modular character - head and body in two parts, so that we can replace a different head model for a character to create a different look, and the body model can be reused.
However, we found that there is a conspicuous seam at the neck joint, such a seam does not appear in blender. We think this is a lighting issue but don’t know how to solve it, because when I changed the view mode to “no lighting”, the seam disappeared. Turning off the “cast shadows” option for the light source doesn’t help.
We also noticed a seam in the character’s UV joints, which is also not visible in “no lighting” mode.
Any ideas or advice would be appreciated.
Thanks in advance.

In Blender:

1
11488×436 323 KB

2
2866×434 206 KB

In Unreal Engine 5.2:
3

4
4718×264 171 KB

Disable lighting, it looks fine:
5

2

I think it’s because of the normals at the joint.

You can rewrite the normals in blender using a data transfer modifier.

You’ll need a cylinder ( or whatever shape the neck would be if it wasn’t cut ) position in exactly the same spot to use as a reference.

Not exactly the right vid, but something along these lines.

3

Thanks for your help. We tried your suggestion and found that there were some problems with the normals. We rewrote the normals and it worked. Thank you.

1 Like